Let's say a Probe Droid is on a single space of blocking terrain can a figure on a space straight next to it make a melee attack?

The RRG says "adjacent" figures can attack it (rules for mobile p. 19) but the rules for adjacent say those figures are not adjacent.

Now let's say the figure is diagonally next to it. Would it now be adjacent because they share a corner and not an edge with blocking terrain?

You can draw line of sight to a figure or object on a blocking space, but you cannot draw line of sight through the blocking space.

RRG also explicitly allows draw line of sight and adjacent figures to attack a figure on a blocking space, so you can be adjacent to a blocking space. Many missions also have objects in blocking spaces and you can interact with them. (Sharing just a corner would still have the spaces be adjacent, thus the figure on the blocking space to be adjacent to the attacker.)

(Figures and objects on blocking spaces are poorly defined in the RRG, but you can piece this together from there, and I have confirmed with the designers how it's supposes to work regardless of the vague rules.)

So the Stormtrooper cannot draw line of sight to the Probe Droid, right?

Now the Stormtrooper can attack the Probe Droid but a normal figure would be safe? Poor droid!

Example 3: The droid is safe again?

All correct. (Oops, didn't read your comments on the other 2 pictures, assumed and made an ass out of me. My answer is still correct.)

1. You can't draw line of sight through other blocking spaces.

2&3. You can't draw line of sight through blocking terrain edges.

So can we say the red edges on the space of the mobile figure I want to target disappear and anything else stays normal?

Now the Stormtrooper can attack the Probe Droid but a normal figure would be safe? Poor droid!

Sorry I think this is wrong.

If the entire space the Droid is standing on were enclosed with red lines, then yes it would be a target, but since it's just a couple edges of the space, and the whole space itself isn't blocking terrain, the droid is safe.

So can we say the red edges on the space of the mobile figure I want to target disappear and anything else stays normal?

No, I misread your comments on the other 2 pictures and you misunderstood my answer. The Droid is safe in all three cases.

I said you cannot draw line of sight through blocking terrain edges.

So can we say the red edges on the space of the mobile figure I want to target disappear and anything else stays normal?

No, I misread your comments on the other 2 pictures and you misunderstood my answer. The Droid is safe in all three cases.

I said you cannot draw line of sight through blocking terrain edges.

But in example 2 I don't think I have to draw the line through the edge.

But in example 2 I don't think I have to draw the line through the edge.

I don't see how you can draw a line from any corner of the Stormtrooper to any corner of the Probe Droid without crossing the red blocking terrain edge. (The blocking terrain edge is between the spaces. Otherwise blocking terrain edges would be irrelevant in blocking line of sight to the spaces they divide.)

See (15) from the RRG LoS examples.

Think of it this way:

If the red lines were on all 4 sides of the spaces, the Probe Droid would be on top of the object. But since the red lines are only in between the spaces, it's essentially a wall, so the Probe Droid is behind the red lines rather than on top of them.

If it were on top you could see it (ignoring the red lines) but since it's behind, you can't see it and must respect the red lines.

Also note that you can only draw line of sight into a blocking terrain space if it contains a figure (or object). There is no provision to draw line of sight through or into a blocking terrain edge .

Think of it this way:

If the red lines were on all 4 sides of the spaces, the Probe Droid would be on top of the object. But since the red lines are only in between the spaces, it's essentially a wall, so the Probe Droid is behind the red lines rather than on top of them.

If it were on top you could see it (ignoring the red lines) but since it's behind, you can't see it and must respect the red lines.

So a1bert, do you agree on this?

There are no blocking spaces in that tile, so the rule about drawing line of sight into blocking spaces containing the target figure does not apply.

You cannot draw line of sight through blocking terrain edges.

Okay so I had some problems to recognize that a space having only an edge with blocked terrain doesn't mean the space is a space containing blocked terrain.

So now to be sure... the stormtropper can attack either of the droids? The droids can attack each other?

Yes, the Stormtrooper can draw line of sight to either of the blocking spaces (if targeting the figure on that space).

Either droid can also draw line of sight out of their space (even when it's blocking terrain) to the Stormtrooper.

And combined: either Droid can draw line of sight out of their spaces and into an adjacent space when attacking a figure on that space.

(Now, if the Probe Droid in the middle would decide to self-destruct, then we're back to needing to interpret and hand-wave a bit, but I would rule that both the other figures would suffer the damage rolled. The Stormtrooper for sure, and the other Probe Droid by the two blocking spaces being adjacent spaces due to containing figures or objects.)

Thanks for the patience.

No problem, good example pictures.

So the Stormtrooper cannot draw line of sight to the Probe Droid, right?

in Example 1, if the Stormtrooper is just one square Up-Right, does he have LOS to probe droid? I can't find it in reference rules.

in Example 1, if the Stormtrooper is just one square Up-Right, does he have LOS to probe droid? I can't find it in reference rules.

Yes, see the last example a few posts above.

See Mobile from the rules reference guide for the rule.

You can draw line of sight to a figure or object on a blocking space, but you cannot draw line of sight through the blocking space.

RRG also explicitly allows draw line of sight and adjacent figures to attack a figure on a blocking space, so you can be adjacent to a blocking space. Many missions also have objects in blocking spaces and you can interact with them. (Sharing just a corner would still have the spaces be adjacent, thus the figure on the blocking space to be adjacent to the attacker.)

(Figures and objects on blocking spaces are poorly defined in the RRG, but you can piece this together from there, and I have confirmed with the designers how it's supposes to work regardless of the vague rules.)

That's kind of bizarre, because I didn't think the rules were vague until this thread.

If a figure with mobile occupies a space containing blocking terrain, line of sight can be traced to that figure

I've always interpreted that as though a figure with mobile cannot avoid being targeted by parking on top of blocking terrain. It doesn't say something like "line of site can be traced to that figure provided that it is not drawn through blocking terrain not occupied by the target figure."

I know the blocking terrain section says:

Figures cannot enter, be pushed into, count spaces through, or trace line of sight through blocking terrain

But I have no idea why that previous line in the mobile section would be there if it wasn't intended to allow another figure to target a mobile figure on blocking terrain. If that's the intent, I would agree that it's worded pretty badly.

Like I said, figures and objects on blocking spaces is poorly defined and worded in the RRG. I have gathered the bits and pieces from the RRG to base my understanding, which has been confirmed by the designers and agreed with the technical editor.

Also note that the rules only talk about terrain spaces (although the word "spaces" is omitted in places), not larger areas - for example there is no game term for a collection of connected blocking terrain spaces.

The gist of it is that "If a figure with mobile occupies a space containing blocking terrain, line of sight can be traced to that figure." does not allow you to draw line of sight through other blocking spaces. However, you need to combine this rule with the other rules about blocking spaces and the examples and some common sense and knowledge of how the overall game works.

I think RogueLieutenant said it well: for purposes of interacting and attacking a figure or object on a blocking space the target space effectively becomes a non-blocking space. (But does not affect the other spaces the figure occupies and no other blocking spaces.)

Adjacency works because blocking spaces can still be adjacent to your space, and objects and figures on an adjacent space are adjacent objects/figures, and a lot of mission rules expect you to be able to interact with objects in blocking spaces although the RRG is quiet about that.

I for one would like to see a passage in the FAQ on figures on blocking terrain, considering all the huge gaps in the rules on this.

The gist of it is that "If a figure with mobile occupies a space containing blocking terrain, line of sight can be traced to that figure." does not allow you to draw line of sight through other blocking spaces.

You can only draw line of sight into the blocking space you target, not through the other blocking spaces the target figure (or any other figure) occupies. You thus need to target the blocking space you "see", because you can't draw line of sight through blocking spaces, only into them (if a figure or object you are targeting or interacting with is there) - or out of them if you're attacking from a blocking space to non-blocking space.

I once started to write better rules for how adjacency and line of sight worked for blocking spaces, but gave up because I found some potential holes in the way even regular blocking terrain spaces and blocking terrain edges work. It's very hard to cover all cases with short rules.